Why SAN is Expensive

Storage area network, an architecture to remotely attach computer storage. SAN devices connect to a number of servers using fibre channel. Most SAN systems use the small computer system interface protocol. An add-on card must be installed in each computer that will be connected to
a SAN device. A SAN is seen by a connected server as a local drive. Since the SAN serves data only as raw disk blocks, the server itself must provide file management.

SAN protocols include Fibre Channel, iSCSI, ATA over Ethernet (AoE) and HyperSCSI.

A NAS is a single storage device that operate on data files.Typically makes Ethernet and TCP/IP connections.

Both NAS and SAN over come the limitations of the traditionally used Direct Attached Storage (DAS).NAS appears to the client OS (operating system) as a file server (the client can map network drives to shares on that server) whereas a disk available through a SAN still appears to the client OS as a disk, visible in disk and volume management utilities (along with
client’s local disks), and available to be formatted with a file system and mounted.
SAN
SAN Fabric
The hardware that connects workstations and servers to storage devices in a SAN is referred to as a “fabric.” The SAN fabric enables any-server-to-any-storage device connectivity through the use of Fibre Channel switching technology.

SAN-SWITCH  SAN-Fibercable

Manufactors

brocade
http://www.brocade.com/products/all/switches/index.page
http://www.brocade.com/solutions-technology/technology/san-fabric-technology/index.page

ibm
http://www-03.ibm.com/systems/in/networking/switches/san/entry/
http://pic.dhe.ibm.com/infocenter/svc/ic/index.jsp?topic=%2Fcom.ibm.storage.svc.console.doc%2Fs

vc_sanfabricoverview_27wwma.html
http://www.redbooks.ibm.com/abstracts/sg246384.html?Open

hp
http://www8.hp.com/us/en/products/data-storage/data-storage-products.html?compURI=1410821#.Ut6y

X_u6at8
http://www8.hp.com/us/en/products/switches/#!view=column&page=1

cisco
http://www.cisco.com/en/US/products/hw/ps4159/
http://www.cisco.com/en/US/products/ps7079/

sgi
http://www.sgi.com/products/storage/infrastructure/

dell
http://www.dell.com/in/business/p/fibrechannel-switches

List of Fibre Channel switches
http://en.wikipedia.org/wiki/List_of_Fibre_Channel_switches
http://en.wikipedia.org/wiki/Fibre_Channel
http://en.wikipedia.org/wiki/Fibre_Channel_switch

emc
http://india.emc.com/storage/connectrix/connectrix.htm#!switches

 

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Posted on July 19, 2014, in Storage Technologies. Bookmark the permalink. Leave a comment.

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